fix everything

package.json

@@ -16,6 +16,7 @@
     "ava": "^0.17.0",
     "babel-cli": "^6.18.0",
     "babel-core": "^6.18.2",
+    "babel-plugin-transform-runtime": "^6.15.0",
     "babel-polyfill": "^6.16.0",
     "babel-preset-es2015": "^6.16.0",
     "babel-preset-react": "^6.16.0",
@@ -57,6 +58,14 @@
       "browser"
     ],
     "rules": {
+      "eqeqeq": [
+        "error",
+        "always",
+        {
+          "null": "ignore"
+        }
+      ],
+      "no-eq-null": 0,
       "import/no-unresolved": 0,
       "new-cap": 0
     }

src/babel.js

@@ -29,7 +29,7 @@ export default function ({types: t}) {
     visitor: {
       JSXOpeningElement(path, state) {
         if (state.hasJSXStyle) {
-          if (state.ignoreClosing === null) {
+          if (state.ignoreClosing == null) {
             // this flag has a two-fold purpose:
             // - ignore the opening tag of the parent element
             //   of the style tag, since we don't want to add
@@ -64,7 +64,7 @@ export default function ({types: t}) {
       },
       JSXElement: {
         enter(path, state) {
-          if (state.hasJSXStyle === null) {
+          if (state.hasJSXStyle == null) {
             const styles = findStyles(path.node.children)
 
             if (styles.length > 0) {

test/index.js

@@ -6,13 +6,14 @@ import test from 'ava'
 import {transformFile} from 'babel-core'
 
 // Ours
-import plugin from '../dist/babel'
+import plugin from '../src/babel'
 import read from './_read'
 
 const transform = file => (
   new Promise((resolve, reject) => {
     transformFile(path.resolve(__dirname, file), {
       plugins: [
+        'transform-runtime',
         plugin
       ]
     }, (err, data) => {